Chapter 21, Problem 80GP

A large electroscope is made with “leaves” that are 78-cm-long wires with tiny 24-g spheres at the ends. When charged, nearly all the charge resides on the spheres. If the wires each make a 26° angle with the vertical (Fig. 21–72), what total charge Q must have been applied to the electroscope? Ignore the mass of the wires.

FIGURE 21–72

Problem 80.